Fujitsu F2MC-16LX Series, Hardware Manual

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CHAPTER 17 Address Match Detecting Function
17.4 Explanation of Operation of Address Match Detection
Function
If the addresses of the instructions executed in the program match those set in the
detection address setting registers (PADR0 and PADR1), the address match detection
function will replace the first instruction with the INT9 instruction ("01
H
") and branch to
interrupt processing program.
■
Operation of Address Match Detection Function
Figure 17.4-1 shows the operation of the address match detection function when the detect addresses are set
and an address match is detected.
Figure 17.4-1 Operation of Address Match Detection Function
■
Setting Detect Address
1)Disable the detection address setting register 0 (PADR0) where the detect address is set for address
match detection (PACSR: AD0E = 0).
2)Set the detect address in the detection address setting register 0 (PADR0). Set "FF
H
" at the higher bits
of the detection address setting register 0 (PADR0), "00
H
" at the middle bits, and "1F
H
" at the lower bits.
3)Enable the detect address setting register 0 (PADR0) where the detect address is set for address
match detection (PACSR: AD0E = 1).
■
Program Execution
4)If the address of the instruction to be executed in the program matches the set detect address, the
first instruction code at the matched address is replaced by the INT9 instruction code ("01
H
").
5)INT9 instruction is executed. INT9 interrupt is generated and then interrupt processing program is
executed.
Address
FF001C:
FF001F:
FF0022:
Replaced by INT9(01
H
)
Instruction code
A8 00 00
4A 00 00
4A 80 08
Mnemonic
MOVW
MOVW
MOVW RW0,#0000
A,#0000
A,#0880
Instruction address
executed in program
matches with detection
address setting register 0.
Program Execution